Chicago-latrobe 44728 Jobber Drill Bit Wire 58 Hss 135 Degree

Product Description

The CHICAGO-LATROBE 44728 is a jobber length drill bit in wire gauge size 58, with a decimal diameter of 0.0420 inches. It is manufactured from high speed steel with an oxide finish coating and features a 135-degree split point with web thinning for improved self-centering and reduced walking on entry. The regular spiral flute and straight-cylindrical shank are designed for use in standard drill chucks. This is a heavy duty, high performance bit built to NAS 907 Type B specification, suited to production and maintenance drilling in metal fabrication and mechanical trade environments.

This bit is rated for drilling cast iron, stainless steel, and carbon steel. The 135-degree point angle and web-thinned tip reduce thrust requirements, making it well suited for hand-held drilling operations and drill press work on hard or abrasive ferrous materials. At 1.625 inches overall length with an 0.6875-inch flute length, it is optimized for shallow-hole applications where a compact tool profile is required. Machinists, tool and die technicians, and maintenance mechanics commonly use wire gauge bits in this size range for tapping prep, pilot holes, and precision fitting work.

Key Features

• Wire size 58 with 0.0420-inch decimal diameter and diameter tolerance of -0.0005 to 0.0000 inches
• 135-degree standard point with web thinning for fast, accurate entry into ferrous materials
• High speed steel construction with oxide coating for heat and wear resistance
• Regular spiral, 2-flute design promotes chip evacuation in cast iron and steel
• Straight-cylindrical shank fits standard drill chucks without adapters
• Meets NAS 907 Type B specification for heavy duty, high performance drilling

Compatibility

Designed as an OEM-specification replacement or production-use drill bit for applications requiring wire gauge size 58 tooling on cast iron, stainless steel, and steel workpieces per NAS 907 Type B standards.

Installation Notes

This bit is installed by machinists, tool and die technicians, and general maintenance mechanics. Secure the straight-cylindrical shank fully in a properly sized drill chuck before operation. Ensure the drilling machine is powered down and brought to a complete stop before changing bits. Use appropriate cutting fluid or coolant for stainless steel applications to extend tool life, noting that this bit does not support through-coolant delivery.